Discussion
What property of a varactor diode is exploited?
Answer: C
A varactor is used as a voltage-controlled capacitor, because the depletion layer widens with reverse bias and the capacitance falls. That is what allows electronic tuning and the voltage-controlled oscillator at the heart of a phase-locked loop. The low drop belongs to a Schottky, light emission to a light emitting diode, and negative resistance to a tunnel diode. Every junction has this capacitance; the varactor is simply built to make it large and predictable.
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